Bending of few-layer graphene leads to interlayer slip, and slipping lowers the bending stiffness. Beyond a critical bending angle, the graphene layers bend like a stack of paper, with a state of superlubricity for interlayer slip.
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Huang, R. Bending with slip. Nat. Mater. 19, 259–260 (2020). https://doi.org/10.1038/s41563-020-0604-0