Quantitative theory of reflections across quasiconformal polygonal lines

The paper continues the author's research in the problem of quantitative investigation of basic curvelinear quasiinvariants of quasiconformal curves. It concerns polygons with infinite number of vertices and provides various distortion estimates in terms of intrinsic geometric characteristics of polygons. In particular, this implies the coarse upper and lower estimates for the Grunsky and Teichmuller norms of a conformal map of the disk onto any piecewise $C^{1+}$-smooth bounded quasicircle.