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A theory must explain where it appears and where it does not.","posed_since":"","precise":"Measurements show the anti-Q-slope is pronounced at $f \\ge 1.3\\,\\mathrm{GHz}$ and weak or absent at lower frequency, and depends on $T$ and on the electron mean free path set by doping. Derive the boundary in $(f,T,\\text{mean free path})$ separating field-decreasing from field-increasing $R_{\\mathrm{BCS}}$.","problem_ref":null,"references":"","settled_by":"A predicted crossover map confirmed by cavities of several frequencies prepared with identical surface treatment.","status_note":"","title":"Frequency and temperature dependence of the 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