Unabsorbed spectral components and polarization properties of model 2 involving a rapidly rotating black hole. Polarization is calculated neglecting an outflow (i.e., v = 0). The orange points in panels (b) and (c) show the average PD and PA measured by IXPE in the soft state of Cyg X-1 (Kravtsov et al. 2025). (a) Total spectrum (solid black curve) and individual spectral components of model 2. The direct thermal disk emission, reflected returning radiation, hybrid Comptonized emission, and its reflection are shown by the dashed red, dashed blue, dot-dashed green, and dotted magenta curves, respectively. (b) PD. The solid black curve shows the net PD resulting from the combined polarization signals of all components, while the colored curves show the contributions from the polarized part of each component to the total flux. (c) PA, measured counterclockwise from celestial north. For the PA calculation, we assume that the disk rotates clockwise and that the disk axis is aligned with the radio jet, adopting a position angle of $-23\stackrel{°}{.}5$. The line styles and colors in panels (b) and (c) correspond to those used in panel (a).