Is the variation sinusoidal as proposed by the column approximation or is there a different functionality? I understand that it would first increase with thickness due to multiple scattering and decrease later due to absorption but do not know the functionality.
This is due to the strong interaction of electrons with matter and is called dynamical diffraction theory. There are several textbooks covering this in great detail, e.g. by PB Hirsch, A Howie, MJ Whelan et al., L Reimer, etc.
Keywords to look for are: extinction distance and excitation error. Thomas
Thanks Dr. Walther. I read through the work by Reimer, they seem to show that the excitation error is replaced by an effective error to account for the breakdown of kinematic scattering beyond a specific value of t when Ig>1.
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