Additional file 2.

Irradiation features and roughness amplitudes after 3-keV ion irradiation. Figure S2. (a) 3-D image showing the effect of ion irradiation on the FLG edges after Ar+ ion irradiation of 3 keV. A, B and C denote the irradiated edges, cross sputtered areas at 53° from A direction and shadowing features, respectively. (b) PSD obtained from the image shown in (a) showing the amplitude of the surface's roughness of features A, B, and C as a function of the spatial frequency. FFT of the image shown in (a) revealing the presence of features A, B and C is shown in the inset of (b).

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Al-Harthi et al. Nanoscale Research Letters 2012 7:466   doi:10.1186/1556-276X-7-466