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The folding of monolayer graphene leads to new layered systems, termedtwisted bilayer graphene (TBG), generally displaying a certain interlayerrotation away from crystallographic alignment. We here present an atomic forcemicroscopy study on folded graphene, revealing unexpectedly large twist angledependent modulations of ~3 angstrom in interlayer distance. At the TBGsurface, we find enhanced friction attributable to superlubricity in betweenincommensurate layers. At the bended edge, the radius of curvature scales withthe folded length, congruent to earlier studies on carbon nanotubes.

Interlayer Configurations in Twisted Bilayers of Folded Graphene