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Planar T graphene after
geometry optimization can be described by the plane group
p4mm with a lattice constant 3.42A ¡ã containing four atoms
in each cell, close to the value (3.47 A ¡ã ) of the model 7 in
[3]. Buckled T graphene of the plane group p4mm has a
lattice constant 4.84A ¡ã and an equilibrium height difference
(z) of about 0.55 A ¡ã between two nearest-neighbor tetrarings.

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