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--- documentation:adaptive_layer_segmentation [2011/11/15 20:10] – created 142.103.140.43
+++ documentation:adaptive_layer_segmentation [2013/06/20 02:31] (current) – macke
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+== Roughness Models ==
+The roughness model assumes a continuous transition (error function) of the optical constants between two layers and can be altered by the roughness parameter σ.
+Two modes implemented to calculate the spectra.
+  * Nevot&Croce
+  * Adaptive Layer segmentation (slicing)
+== Adaptive Layer Segmentation Model ==
+The slicing parameters can be changed in the "Adaptive Layer Segmentation" sheet.
+The default model is "local" which means the method used in the Parratt32 software from the HMI.
+The global model is described in the diploma thesis of M. Harlander.
+If the thickness is smaller than σ both models describe the interface almost like the roughness approximation by Nevot&Croce.
+However there are differences for the case σ>thickness. The local model describes the σ>thickness case like the Nevot&Croce approximation.
+The global models should give you physical more feasible results which cannot be modelled by the analytical approximation.