1. Laboratory for Solid State Physics; ETH Zürich; Otto-Stern-Weg 1 CH-8093 Zürich Switzerland
2. Electron Microscopy Center; Empa-Swiss Federal Laboratories for Materials Science and Technology; Überlandstrasse 129 CH-8600 Dübendorf Switzerland
3. IHP; Im Technologiepark 25 D-15236 Frankfurt (Oder) Germany
4. Brandenburgische Technische Universitaet; Konrad-Zuse Strasse 1 D-03046 Cottbus Germany