Bilayer splitting and wave functions symmetry in Sr3Ir2O7 by Moreschini, L, Moser, S, Ebrahimi, A, Dalla Piazza, B, Kim, K, Boseggia, S, McMorrow, D, Ronnow, H, Chang, J, Prabhakaran, D, Boothroyd, A, Rotenberg, E, Bostwick, A, Grioni, M