Fig. 4: Two-parameter fit to the self-consistent (SC) theory of localization.

Fitting error S for a comparison to diffusion theory (crosses) and SC theory (open circles) for frequencies below the gap frequency νGap (a) and above (b). Adjustable parameters are (kl) and ℓ. c, d Localization parameter (kl) extracted from the fit for the same frequency intervals. We find (kl) = 1 for \({\nu }_{c,l}^{\prime}=0.412\) (ℓc,l/a = 0.513), (c), and \({\nu }_{c,h}^{\prime}=0.506\) (ℓc,h/a = 0.242), (d).