1. Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
2. Elettra-Sincrotrone Trieste, SS 14, Km 163.5, 34149 Basovizza, Italy
3. Center for Electron Microscopy and Microanalysis, Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
4. North Carolina Central University, Durham, NC, USA