1. Dr G. Avramovic-Cingara(cingara@sympatico.ca or g.avramovic.cingara@utoronto.ca) and Professor D. D. Perovic (perovic@utoronto.ca) are in the Department of Materials Science and Engineering, University of Toronto, 184 College St, Toronto, ON, Canada M5S 3E4. Professor H. J. McQueen is in the Department of Mechanical Engineering, Concordia University, Montreal, QB, Canada H3G 1M8.