1. a IBM Corporation, Data Systems Division , Dept 48B/MS 428, Neighborhood Road, Kingston , New York , 12401 , USA
2. b Department of Physics , University College of Swansea , Singleton Park, Swansea , SA2 8PP , Wales , UK
3. c Visiting Academic, Dept. of Microelectronics & Electrical Engineering , Trinity College, Dublin , 2 , Republic of Ireland