Cross-sectional surface line profiles, 2-D FFT power spectra, and height distribution histograms around zero. (a) to (d) show the cross-sectional surface line profiles, acquired from Figure 2 as indicated with white lines. Insets (a-1) to (d-1) are 2-D FFT power spectra and height distribution histograms around zero are shown in (a-2) to (d-2).
Sui et al. Nanoscale Research Letters 2013 8:525 doi:10.1186/1556-276X-8-525