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We study the radiative heat transfer between two semi-infinite half-spaces,bounded by conductive surfaces in contact with vacuum. This setup isinterpreted as a four-terminal mesoscopic transport problem. The slabs andinterfaces are viewed as bosonic reservoirs, coupled perfectly to a scatteringcenter consisting of the two interfaces and vacuum. Using Rytov's fluctuationalelectrodynamics and assuming Kirchhoff's circuital law, we calculate the heatflow in each bath. This allows for explicit evaluation of a conductance matrix,from which one readily verifies B\"{u}ttiker symmetry. Thus, radiative heattransfer in layered media with conductive interfaces becomes aLandauer-B\"{u}ttiker transport problem.

Radiative heat transfer as a Landauer-B\"{u}ttiker problem