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Abstract-The electronic structure of finite parabolic GaAs/Al x Ga 1−x As superlattices is studied. A detailed analysis of the miniband formation is given and the importance of all system parameters is discussed. The dependence of the equidistant miniband separation on the superlattice size is revealed. A comparison with different theoretical methods and experimental data is presented.The calculations are conducted in the framework of the semi-empirical sp 3 s * tight-binding model including spin applying the Green function formalism and the Surface Green Function Matching Method (SGFM) method.