I was also if its possible to use Athena or Artemis to extract the back-scattering properties of Pt and Re from reference samples, and use these properties in fitting a Pt-Re path.
We did a similar procedure (extracting back scattering properties from reference samples), although with FEFFIT, which is the predecessor of IFEFFIT. It should be also done by IFEFFIT by back Fourier transforming the reference samples and extracting amplitude and phases - they can then be combined in the "corrected" EXAFS equation which can be fit to the data by Artemis - with modified amplitude and phase factors. Here is the reference: A. I. Frenkel, M. Vairavamurthy, and M. Newville, A study of the coordination environment in aqueous cadmium-thiol complexes by EXAFS spectroscopy: experimental vs. theoretical standards J. Synchrotron Rad., 8 , 669-771 (2001). The link to the PDF is here: http://pubweb.bnl.gov/users/frenkel/www/EXP-FEFF/thiols.pdf Anatoly