1. W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
2. Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, 08028 Barcelona, Spain
3. Interface Research and Catalysis, Erlangen Center for Interface Research and Catalysis, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
4. Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
5. Materials Research Laboratory, Silesian University of Technology, Gliwice 44-100, Poland
6. ICREA (Institució Catalana de Recerca i Estudis Avançats), 08010 Barcelona, Spain