One-loop electroweak radiative corrections to polarized $e^{+}{e}^{-}\to ZZ$ process

In the paper we recalculate and discuss high-precision theoretical predictions for cross sections of the process $e^{+}{e}^{-}\to ZZ$. We assume a complete one-loop implementation and a possibility of estimating the initial state polarizations, as well as the full-phase calculation. Numerical results are provided by our Monte-Carlo tools MCSANC integrator and ReneSANCe generator for typical energies and degrees of polarization of ILC and CLIC projects in two $\alpha (0)$ and G${}_{\mu }$ electroweak schemes.