The XANES region is comprised of the pre-edge, rising-edge, and post-edge regions. Over the years, certain trends in each region have been identified which help characterize different local chemical and structural properties such as oxidation state and coordination environment . Some trends associated with electronic transitions can be explained by quantum mechanical symmetry arguments; for example, Farges and co-workers showed that in Ti and Ni complexes, pre-edge peak intensity is suppressed as the coordination number increases from 4 → 6, since the number of locally coordinated metal ligands can allow certain electronic transitions (like ligand p-orbital mixing) in the pre-edge energy region . Further, for some Ni materials, this pre-edge feature was found to correlate with the Ni-O distance . Similarly useful, but limited fingerprints exist for other properties of interest. For instance, for some materials, the peak location clearly shifts with the oxidation state .