  Extended x-ray absorption fine-structure (EXAFS) data collected in the
fluorescence mode are susceptible to an apparent amplitude reduction due to the
self-absorption of the fluorescing photon by the sample before it reaches a
detector. Previous treatments have made the simplifying assumption that the
effect of the EXAFS on the correction term is negligible, and that the samples
are in the thick limit. We present a nearly exact treatment that can be applied
for any sample thickness or concentration, and retains the EXAFS oscillations
in the correction term.
