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In this paper, general relationships that allow evaluating the figure ofmerit of both two-dimensional superlattices and three-dimensional crystals witha quadratic and isotropic energy spectrum of free charge carriers are derived.It is shown that with the same values of the so-called dimensionlesstemperature and scattering coefficient, the figure of merit of superlattices isalways lower than that of three-dimensional crystals. The figure of merit ofsuperlattices can become higher that that of three-dimensional crystals if thedimensionless temperature of free charge carrier gas and (or) scatteringcoefficient in them is considerably higher than in three-dimensional crystals.

Use of similatity criteria for evaluating the thermoelectric figure of merit of superlattices