The XNCD originates from cross dipole-quadrupole contributions for certain nonmagnetic materials, such as special types of crystals. It will change sign for opposite direction of propagation (use the ELLIPTICITY card to do this). We performed calculations for LiIO3 and found results very similar to previous multiple scattering XNCD calculations. XNCD requires that the XANES card also be used.
See also: XMCD card