[Ifeffit] Lost second shell

Hi all, I am working with Er doped ZnO and the EXAFS measurements (Er L3) shows that I have not a second shell when I perform the FT. I checked that the phase is not destroying the signal, and that is not the guilty guy. I have two possibilities, that the erbium is segregated on the surface of the particles with a strong disordered phase that destroy second shell information (XANES simulation are different from oxide and hydroxides) or that the atoms are isolated in the surface of the particles. Should I use the card for molecules for isolated atoms? And for the disordered phase, what can I do? Is there another possibility to lose the second shell? Thanks in advance, euG