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The surface roughness is measured by atomic force microscope (AFM) and is characterized by root-mean-square (rms) roughness, which is given by[1,2]
where N is the total number of the surface sites, hi the height of the ith site,and h is the average height of the surface.
1 X. Tan, G. Ouyang, G. W. Yang, Phys. Rev. B 73 (2006) 195322.
2 L. Yu, J. Xu, S. Dong, I. Kojima, Thin Solid Films 516 (2008) 1781-1787.
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