A high resolution, hard x-ray photoemission investigation of La_(2-2x)Sr_(1+2x)Mn_2O_7 (0.30 by Jong, S, Massee, F, Huang, Y, Gorgoi, M, Schaefers, F, Fink, J, Boothroyd, A, Prabhakaran, D, Goedkoop, J, Golden, MS