>What is the expected polarization effect on an oriented fcc lattice >measured at the L3 edge? There is *no* polarization effect in any perfect cubic lattice due to symmetry. You can see this by writing the absorption in terms of the polarization tensor mu = sum_ij epsilon_i* epsilon_j mu_ij Since mu_ij is diagonal for a cubic system (any edge) the epsilon dependence drops out. J. Rehr