It came to the attention of the author that one of the computer programs that was used to generate results for this paper contained a typographical error that led to inaccuracies in Fig. 2. This error has been rectified and the data that were affected by the mistake have been recalculated. Figure 2 of the originally published article should be replaced instead by the amended Figure that appears below. There is no change to the Figure caption as the calculations have been performed for the same parameter choices as in the original version of this Figure. None of the conclusions in the paper are affected by the error found in the code.

Fig. 2
figure 1

The volume fraction at the percolation threshold, \({\varphi }_{c}\) calculated from Eqs. (9)-(18) and (20)-(21), is shown as a function of the fractal dimension \({d}_{F}\) for fixed values of \(\gamma\). In all cases \(R/\delta =100\) and \(\epsilon =0.25\). From top to bottom, \(\gamma\) = 1.1, 1.5, 5, and 25, respectively. The dotted line is drawn with a slope of log (\(2 R/\delta\)), indicating the asymptotic dependence of \({\varphi }_{c}\) upon \({d}_{F}\) found in Eqs. (22) and (25)

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