We calculated Coulomb scattering rates from quantum dots (QDs) coupledto a 2D carrier reservoir and QDs coupled to a 3D reservoir. For thispurpose, we used a microscopic theory in the limit of Born-Markovapproximation, in which the numerical evaluation of high dimensionalintegrals is done via a quasi-Monte Carlo method. Via a comparison of the sodetermined scattering rates, we investigated the question whether scatteringfrom 2D is generally more efficient than scattering from 3D. In agreementwith experimental findings, we did not observe a significant reduction of thescattering efficiency of a QD directly coupled to a 3D reservoir. In turn, wefound that 3D scattering benefits from it’s additional degree offreedom in the momentum space