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. 2016 Feb 18;6:21273. doi: 10.1038/srep21273

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Copyright © 2016, Macmillan Publishers Limited

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(a) Atomic-resolution LAADF STEM image of monolayer graphene. The structure model is overlaid. Blue and yellow lattices show the A and B sublattices. The basis vectors are a₁ and a₂. Simulated LAADF STEM images of AA-stacking TBG are shown in (b) ∑(2, 3) = 19 (θ = 13.17°) and (c) ∑(1, 7) = 19 (θ = 46.83°), with the structure models overlaid on the images. The solid parallelograms are the primitive unit cells and the dashed parallelogram is a non-reduced unit cell for the case of κ(m, n) = 1.