Submitted on: 05 May 2014.
Revised on: 23 July 2014.
Accepted on: 26 August 2014.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 09 March 2006.
Revised on: 02 July 2006.
Accepted on: 13 July 2006.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 26 August 2017.
Revised on: 13 October 2017.
Accepted on: 25 October 2017.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 02 July 2009.
Revised on: 11 October 2009.
Accepted on: 15 November 2009.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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