Case 12: 5 m LVF regolith, 5 m HVF ice. From left to right: diagram of scenario showing subsurface profile. Stokes S₁ radargram displaying total return power in dB, with range-averaged response overlaid as a black line. CPR radargram, with range-averaged response overlaid as a black line. Degree of polarization (m) plotted against apparent depth, with background shading denoting regolith, ice, and basalt units. The m-χ decomposition plotted against apparent depth. The m-χ decomposition radargram. Dashed vertical lines in S₁ and m-χ plots at −123 dB indicate the NE-Γ noise floor (SNR = 0 dB). Orange, blue, and brown horizontal lines denote interfaces of regolith, ice, and basalt, respectively.