Out-of-plane shear and out-of plane Young's modulus of double-layer graphene

► We model double-layer graphene using DFT with periodic boundary condition. ► We calculate the out-of-plane Young's modulus of double-layer graphene. ► We calculate the out-of-plane shear modulus of double-layer graphene. ► The elastic properties of double-layer graphene compared to those of graphite.