XANES is considerably harder to fully interpret than EXAFS. Precise and accurate
calculations of all spectral features are still difficult, time-consuming, and not always
reliable. This situation is improving, but at this point, quantitative analyses of XANES
using ab initio calculations are very rare. Still, such calculations can help explain which
bonding orbitals and/or structural characteristics give rise to certain spectral features,
but are beyond the scope of this treatment, and will have to wait for another day.