$WZ$ Production at $e\gamma$ Colliders and Anomalous Quartic $WWZ\gamma$ Coupling

We investigate the constraints on the anomalous quartic $W^{+}{W}^{-}Z\gamma$ gauge boson coupling through the process $e^{-}\gamma \to {\nu }_e{W}^{-}Z$. Considering incoming beam polarizations and the longitudinal and transverse polarization states of the final W and Z boson we find 95% confidence level limits on the anomalous coupling parameter $a_n$ with an integrated luminosity of 500 $f{b}^{-1}$ and $\sqrt{s}$=0.5, 1 TeV energies. We show that initial beam and final state polarizations improve the sensitivity to the anomalous coupling by up to factors of 2 - 3.5 depending on the energy.