  We present a polarization-resolved and temperature-dependent Raman scattering
study of AFe2As2 (A = Ca, Eu). In the spin-density-wave (SDW) phase, spectral
weight redistribution is observed in the fully symmetric and non-symmetric
scattering channels at different energies. An anisotropic Raman response is
observed in the fully symmetric channel in spontaneously detwinned CaFe2As2
samples. We calculate the orbital-resolved electronic structures using a
combination of density functional theory and dynamical mean field theory
(DFT+DMFT). We identify the electronic transitions corresponding to these two
spectral features and find that the anisotropic Raman response originates from
the lifted degeneracy of the dxz/yz orbitals in the broken symmetry phase.
