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. 2018 Apr 23;4:4. doi: 10.1038/s41378-017-0001-2

Fig. 4.

Fig. 4

a Thickness of deposited metal layers and b their corresponding surface roughness versus sputtering time. Inserted top-view HR-SEM images in b (scale bar: 200 nm) show the morphological appearance of the deposited metal layers at various sputtering times