Effect of symmetry distortions on photoelectron selection rules and   spectra of Bi_2Sr_2CaCu_2O_{8+ delta}
  We derive photoelectron selection rules along the glide plane in orthorhombic Bi_2Sr_2CaCu_2O_{8+\delta} (Bi2212). These selection rules explain the reversed intensity behavior of the shadow and the main band of the material as a natural consequence of the variating representation of the final state as a function of k_\parallel. Our one-step simulations strongly support the structural origin of the shadow band but we also introduce a scenario for detecting antiferromagnetic signatures in low doping. 
V. Arpiainen and M. Lindroos