1. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
2. LMGP, University Grenoble-Alpes, CNRS, F-3800 Grenoble, France
3. Kodak Research Laboratories, Eastman Kodak Company, Rochester, New York 14650, USA
4. Holst Centre/TNO Thin Film Technology, Eindhoven, 5656 AE, The Netherlands
5. Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands