I have one question regarding the XAFS data. I have collected absorption coefficient in fluorescence regime of a CuSO4 penta hydrate sample(however my question can be generalized to any compound). 

Through Athena I then obtained the x\mu(eV) spectra as well as \chi(k) and \chi(R). I am wondering how can I assign a unit to the x\mu values. I would like to have it in the cm^-1 or cm^2 kg^-3 unit so than I can match it with tabulated data for the Copper absorption coefficient and proceed with my studies. 

In case a treatment is needed for the normalized \mu , that would also suit my situation.

My idea was to divide by the thickness of the sample but I don't find a reasonable justificiation for this.

I really hope I made the question clear to any reader this time, and if that is not the case I apologyze in advance.

Best Regards

Matteo