Applied Physics Letters, 31 March 2008
Appl. Phys. Lett. 92, 133302 (2008) (3 pages)
©2008 American Institute of Physics. All rights reserved. 
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FOOTNOTES
aPresent address: Department of Polymer Science and Engineering, Chungju National University Chungju, Chungbuk 380-702, Korea.
bElectronic mail: evans@engr.wisc.edu.
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