Interface roughness layers

[lnacquaroli]

It would be nice to have interface roughness layers at the top and bottom of a certain layer. It is generally accepted to fit the roughness of a thin film with an EMA at the top and bottom, using the index of refraction of the same layer of interest as nhost and something else as the ninc.

[lnacquaroli]

This can be done using the current module but without the same index model for the layer of interest and the component inside the EMA.

[lnacquaroli]

We could build the RI and thickness arrays and then asked, with a new keyword, if there is an interface for the layer, and push it in between.