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Analysing some experimental facts, a modification of Ohm-Kirchhoff's constitutive transport relation containing diffusion-related term was established. Simultaneous application of this formula and basic ideas of stochastic electrodynamics to a two-dimensional electron liquid (2DEL) enabled us to obtain relations coupling screening and transport properties of the 2DEL, which may be useful, e.g. for the interpretation of low-temperature magneto-capacitance experiments.