Submitted on: 14 October 2006.
Revised on: 09 December 2006.
Accepted on: 05 January 2007.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 23 July 2010.
Revised on: 16 October 2010.
Accepted on: 18 November 2010.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 07 April 2001.
Revised on: 21 May 2001.
Accepted on: 09 June 2001.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 23 October 2023.
Revised on: 02 January 2024.
Accepted on: 25 January 2024.
___________________APPLIED SURFACE SCIENCE---ELSEVIER