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. 2018 Dec 19;9:5387. doi: 10.1038/s41467-018-07558-3

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© The Author(s) 2018

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Fig. 2 — Optical images and AFM scans of a heterostructure after cleaning. a Optical t-hBN: top hBN. b-hBN: bottom hBN. SLG: single layer graphene. b Optical dark field image of the sample. c AFM. The dashed lines show the location of the SLG within the heterostructure. Scale bars 20 μm