  The reduced tension $\sigma_{cd}$ of the interface between the confined and
the deconfined phase of $SU(3)$ pure gauge theory is determined from numerical
simulations of the first transfer matrix eigenvalues. At $T_c = 1/L_t$ we find
$\sigma_{cd} = 0.139(4) T_c^2$ for $L_t = 2$. The interfaces show universal
behavior because the deconfined-deconfined interfaces are completely wet by the
confined phase. The critical exponents of complete wetting follow from the
analytic interface solutions of a $\Z(3)$-symmetric $\Phi^4$ model in three
dimensions. We find numerical evidence that the confined-deconfined interface
is rough.
