upd hugo docs

hugo/content/ex/sample/assemblies/lattice-ori-distr.md

@@ -14,7 +14,7 @@ The differently oriented lattices are incoherently summed
 using a loop over the parameter distribution samples.
 This is currently supported only under Python scripting, not in the GUI.
 
-Class references: [Layer](/ref/sample/multilayer/layer), [Distributions](/ref/other/distributions).
+Class references: [Layer](/ref/sample/sample/layer), [Distributions](/ref/other/distributions).
 
 {{< galleryscg >}}
 {{< figscg src="/img/auto/scatter2d/LatticeOrientationDistribution.png" width="450px">}}

hugo/content/ex/sample/particles/polydispersity.md

@@ -12,7 +12,7 @@ The uncorrelated particles are added to a layout using a loop
 over the parameter distribution samples. This is currently supported
 only under Python scripting, not in the GUI.
 
-Class references: [Layout](/ref/sample/multilayer/layout),
+Class references: [Layout](/ref/sample/sample/layout),
 [Distributions](/ref/other/distributions).
 
 {{< galleryscg >}}

hugo/content/gui/gui-fitting/index.md

@@ -80,7 +80,7 @@ Remember to set the instrument linked to the data (here, "GISAS").
 ### 4. Performing a fit
 
 #### 4.1 Preparation for fitting
-To setup the fitting job, switch back to the Simulation View. In the "Real Data" field, select the name of the real (experimental) dataset which was imported. Now, the data selection box states, as shown below, that an instrument "GISAS" will be used together with the sample "Sample", which represents the multilayer with cylinders that was constructed in section 1, in order to fit the dataset "experimental_data". Click on the "Run Simulation" button to start the simulation.
+To setup the fitting job, switch back to the Simulation View. In the "Real Data" field, select the name of the real (experimental) dataset which was imported. Now, the data selection box states, as shown below, that an instrument "GISAS" will be used together with the sample "Sample", which represents the sample with cylinders that was constructed in section 1, in order to fit the dataset "experimental_data". Click on the "Run Simulation" button to start the simulation.
 
 {{< figscg src="/img/draw/tutorial_fitintro04_simulation.png" width="800px" class="center" >}}
 

hugo/content/introduction/architecture/index.md

@@ -37,7 +37,7 @@ to be created.
 
 {{< figure src="/img/draw/nodes_architecture4.png" class="center">}}
 
-The parent MultiLayer object represents the sample and contains three
+The parent Sample object represents the sample and contains three
 children: the semi-infinite air layer, the semi-infinite substrate
 layer, and the interface between them. The air layer contains the
 so-called ParticleLayout object, which holds information about the

hugo/content/ref/sample/multilayer/_index.md

 +++
-title = "Multilayer"
+title = "Sample"
 weight = 35
 +++
 
-## Class MultiLayer (toplevel sample model)
+## Class Sample (toplevel sample model)
 
 In BornAgain, for the time being, a sample is always represented by an
-instance of class `MultiLayer`, even if it is a single-layer SAS sample.
+instance of class `Sample`, even if it is a single-layer SAS sample.
 
 ##### Create an instance and add layers
 
@@ -18,10 +18,9 @@ sample = ba.Sample()
 Layers are then added using either of
 ```python
 sample.addLayer(layer)
-sample.addLayerWithTopRoughness(layer, roughness)
 ```
 
-For the arguments, see sections [Layer](/ref/sample/multilayer/layer) and [Roughness](/ref/sample/roughness).
+For the arguments, see sections [Layer](/ref/sample/Sample/layer) and [Roughness](/ref/sample/roughness).
 
 The layer added first is the top layer (typically vacuum).
 The layer added last is the bottom layer (typically substrate).

hugo/content/ref/sample/multilayer/layer.md

@@ -5,14 +5,14 @@ weight = 36
 
 ## Class Layer
 
-A [MultiLayer](/ref/sample/multilayer) is composed of one or several instances
+A [Sample](/ref/sample/multilayer) is composed of one or several instances
 of class `Layer`.
 
 ##### Create an instance
 
 Each instance is created using the constructor call
 ```python
-layer_i = ba.Layer(material, thickness=0)
+layer_i = ba.Layer(material, thickness=0, roughness=nullptr)
 ```
 Typically, the variable name will contain an index `i`.
 By convention, the numbering starts with the top layer, typically `layer_1`.

hugo/content/ref/sample/multilayer/layout.md

@@ -5,7 +5,7 @@ weight = 37
 
 ## Class ParticleLayout
 
-A [Layer](/ref/sample/multilayer/layer) may contain any number of instances of class `ParticleLayout`.
+A [Layer](/ref/sample/Sample/layer) may contain any number of instances of class `ParticleLayout`.
 If a layer has more than one layout, then their scattering intensities add incoherently.
 
 ##### Create an instance and add particles