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Moiré period. (Right) Moiré pattern obtained from two graphene layers overlaid with a relative twist angle θ. Distances are measured in units of 
, where kθ = 2kD sin(θ/2) with kD being the Dirac wave vector. Blue dots denote areas with local AB coordination. (Left) Smallest positive energy of the interlayer Hamiltonian. The energy vanishes for local AB or BA coordination and reached a maximum of 3w for local AA coordination.
