1. Department of Materials Science 6, University of Erlangen‐Nürnberg, Martensstr. 7, 91058 Erlangen, Germany
2. Groupe d'Etude des Semi‐conducteurs, Université Montpellier 2, CNRS‐UMR5650, 12 Place E. Bataillon, 34095 Montpellier, France
3. Department of Crystallography and Structural Physics, University of Erlangen‐Nürnberg, Bismarkstr. 10, 91054 Erlangen, Germany