1. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136, USA
2. Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, 50-370 Wrocław,
Poland
3. National Institute for Research and Development in Microtechnologies, 077190 Bucharest, Romania and
Hyperion University, 030615 Bucharest, Romania
4. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545,
USA