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Using the standard fluctuational electrodynamics framework, we analyticallycalculate the radiative heat current between two thin metallic layers,separated by a vacuum gap. We analyse different contributions to the heatcurrent (travelling or evanescent waves, transverse electric or magneticpolarization) and reveal the crucial qualitative role played by the dcconductivity of the metals as compared to the speed of light. For poorlyconducting metals, the heat current may be dominated by evanescent waves evenwhen the separation between the layers greatly exceeds the thermal photonwavelength, and the coupling is of electrostatic nature. For well-conductingmetals, the evanescent contribution dominates at separations smaller than thethermal wavelength and is mainly due to magnetostatic coupling, in agreementwith earlier works on bulk metals.

Near field versus far field in radiative heat transfer between two-dimensional metals