Emergent spectra (top panel) and temperature structures (bottom panel) of thin partially ionized hydrogen atmospheres (T_eff = 1.2 × 10⁶ K, B = 4 × 10¹³ G) above a condensed iron surface with Σ = 10 g cm^-2 (solid curves) and Σ = 1 g cm^-2 (dashed curves). An inner boundary condition for the radiation transfer equation, corresponding to the condensed surface radiation properties (see text), was used. The black-body spectra with T = T_eff (dotted curve) and the diluted black-body spectra (f_c = 1.5, D = 1.3^-4), which describe the high-energy part of the spectrum of the atmosphere with Σ = 1 g cm^-2 (dash-dotted curve) are shown for comparison in the top panel. In the bottom panel, the temperature structure of the model with Σ = 10 g cm^-2 using black-body radiation as the inner boundary condition is also shown (dotted curve).