  We give an analytic solution for the propagation of polarised radiation
through a homogeneous water body. As corollaries we derive the vector
bidirectional reflectance distribution function at the bottom of an infinitely
deep water body and compute the asymptotic radiance distribution. These have
applications to polarised radiative transfer simulation in the inhomogeneous
setting. Of independent interest, we give a concise variant formulation of the
azimuthal decoupling via a complex Fourier transform which is applicable to
radiative transfer models in general.
