Insights into the electronic structure of OsO2 using soft and hard x-ray photoelectron spectroscopy in combination with density functional theory by Regoutz, A, Ganose, AM, Blumenthal, L, Schlueter, C, Lee, T-L, Kieslich, G, Cheetham, AK, Kerherve, G, Huang, Y-S, Chen, R-S, Vinai, G, Pincelli, T, Panaccione, G, Zhang, KHL, Egdell, RG, Lischner, J, Scanlon, DO, Payne, DJ