  We have explored the electronic properties of stacked graphene flakes with
the help of the quantum chemistry methods. We found that the behavior of a
bilayer system is governed by the strength of the repulsive interactions that
arise between the layers as a result of the orthogonality of their $\pi$
orbitals. The decoupling effect, seen experimentally in AA stacked layers is a
result of the repulsion being dominant over the orbital interactions and the
observed layer misorientation of 2$^{\circ}-5^{\circ}$ is an attempt by the
system to suppress that repulsion and stabilize itself. For misorientated
graphene, in the regions of superposed lattices in the Moir\'e pattern, the
repulsion between the layers induce lattice distortion in the form of a bump
or, in rigid systems local interlayer decoupling.

Mesoscale and Nanoscale Physics