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i have a 2D binary compound AB (made of one of the 100 family of planes of a rocksalt structure) and i am asked to "consider a single s-orbital on each atom (atomic energies Ea,Eb) and nearest neighbor hopping integrals between pairs of each of the atomic types (AA,BB,AB), neglecting overlap. Write the system of equations that one should solve in the tight binding approssimation, in terms of the hopping integrals (AA,BB,AB) and a (lattice constant)."

i have to discss that problem with my professor for the exam so please help me :S