1. Department of Physics and Materials Science, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden, Dipartimento di Scienze Chimiche, Universitá degli Studi di Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy, MAX-lab, Lund University, Box 118, SE-221 00 Lund, Sweden, Applied Material Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH), 10044, Stockholm, Sweden, and Empa, Swiss Federal Laboratories for Materials Testing and Research, Lerchenfeldstrasse 5, CH-9014 St....