When do structures comprising a few crystalline sheets become truly two dimensional? The number of layers certainly plays a role, but in trilayer graphene, the way they're stacked matters too — as shown in a series of Nature Physics papers from 2011.
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Morpurgo, A. The ABC of 2D materials. Nature Phys 11, 625–626 (2015). https://doi.org/10.1038/nphys3430
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DOI: https://doi.org/10.1038/nphys3430
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