Affiliation: | a Uppsala University, Department of Materials Chemistry, The Ångström Laboratory, P.O. Box 538, Uppsala SE-751 21, Sweden b Research Institute for Technical Physics and Materials Science, P.O. Box 49, Budapest H-1525, Hungary c Linköping University, Department of Physics, IFM, Thin Film Physics Division, Linköping SE-58183, Sweden d Luleå University of Technology, Department of Materials, The Sirius Laboratory, Luleå. SE-971 87, Sweden |