Set upper limit for the spatial frequency of roughness

Upper-limited spatial frequency means that the spatial lateral size of relief is lower-limited.

Default spatial frequency limit 0.5 nm^-1 corresponds to spatial period 2 nm, or the homogeneity size 1 nm.

With such a limit, an rms roughness is not equal to sigma parameter of K-correlation model anymore. That is why these concepts were separated.

Real-space correlation function was removed from the code. It is not used directly in computations and with the cutoff in the reciprocal space it does not correspond to the spectrum anymore.

Reference data were updated.

Resolves #1024 (closed)

requested review from @a.nejati

assigned to @m.svechnikov

marked this merge request as ready

changed the description

added 1 commit

• 0a51b1ac - rm default value

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requested review from @j.wuttke and removed review request for @a.nejati

I reviewed only superficially. This said, it looks good to me.

approved this merge request

merged

mentioned in commit 10439e85