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Figure 4
Parameterization of the periodic multilayer structure. The stacked layers share the same thickness dmonolayer, roughnesses and SLD densities. Most of the parameters introduced are relative to dmonolayer. Two sigmoid functions modulate the resulting periodic SLD profile. The position of the first sigmoid csig defines the number of monolayers and the corresponding thickness dfilm = dmonolayercsig, while its width σsig determines the surface roughness σfilm = σsigdmonolayer. The second sigmoid modulates the contrast Δρ between the layers, resulting in smoother SLD profile at the surface.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 6| November 2023| Pages 1064-1075
https://doi.org/10.1107/S160057752300749X
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