1. Functional Nanomaterials Institute for Materials Science; University of Kiel; Kaiserstr. 2 D-24143 Kiel Germany
2. Synthesis and Real Structure; Institute for Materials Science; University of Kiel; Kaiserstr. 2 D-24143 Kiel Germany
3. Department of Microelectronics and Biomedical Engineering and National Center for Materials Study and Testing; Technical University of Moldova; 168 Stefan cel Mare Blvd. MD-2004 Chisinau Republic of Moldova
4. Max Planck Institute for Solid State Research; Heisenbergstr. 1 D-70569 Stuttgart Germany