The document discusses the resolution limit of polarimetric radar and the performance of the polarimetric bandwidth extrapolation (PBWE) technique. It presents a signal model for polarimetric radar and derives the statistical resolution limit (SRL) and Cramér-Rao bound (CRB) for estimating the separation between two targets. Computer simulations show that PBWE achieves resolutions close to the SRL, and polarization information helps improve resolution when the target polarizations are different. Polarimetric radar can achieve higher resolution on average than single-polarization radar.