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An approximate but soluble single-site theory for the density of states of a two-band spatially disordered system, the single super-chain approximation/effective-medium approximation (SSCA/EMA), is compared with direct simulations on and off-diagonally disordered, two-level tight-binding model. The theory reproduces the simulations remarkably well.
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Bush et al. (1989) studied this question.
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