Ordinary dielectric function of corundumlike alpha-Ga2O3 from 40 meV to 20 eV

We acknowledge the expert beamtime support at the Metrology Light Source (MLS) in Berlin by the Physikalisch Technische Bundesanstalt (PTB) and financial support by the Deutsche Forschungsgemeinschaft (DFG) in the framework of Major Research Instrumentation Program No. INST272/230-1 and by the Ministerium fur Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen, the Senatsverwaltung fur Wirtschaft, Technologie und Forschung des Landes Berlin, and the Bundesministerium fur Bildung und Forschung. The part of the German groups of this work was performed within the framework of GraFOx, a Leibniz-Science Campus. This work was also supported by the Spanish MINECO/FEDER under Contract No. MAT2015-71305-R.