  Incommensurately twisted graphene bilayers are described by long-wavelength
theories, but to date such theories exist only at small angles of interlayer
rotation. We construct a long wavelength theory without such a restriction,
instead requiring nearness to commensuration. The theory inherits its energy
scale from the exactly commensurate bilayer that it is close to. It is a
spatial interpolation between the low-energy theories of commensurate
structures with the two possible sublattice exchange (SE) symmetries: SE even
and SE odd. In addition to generalizing existing theories, our theory brings
into experimental reach so far elusive commensuration physics in graphene such
as band gaps and nontrivial band topology.
