Submitted on: 21 January 2003.
Revised on: 27 February 2003.
Accepted on: 08 April 2003.
___________________APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Submitted on: 13 May 2009.
Revised on: 23 August 2009.
Accepted on: 15 September 2009.
___________________APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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