Table 2.

Structural data on the precursor adlayer formed in Cl-containing solution

NaCl + PbCl2	Parameter	−1.20 V	−0.90 V
Hg	σi [Å]	1.01 ± 0.01	0.89 ± 0.01
Pb(OH)Clad-I	θI $d_{\mathrm{Hg}-\mathrm{O}}$ [Å]		0.84 ± 0.02 2.63 ± 0.02
Pb(OH)Clad-II	θII $d_{\mathrm{Hg}-\mathrm{O}}$ [Å]		0.16 ± 0.02 2.63 ± 0.02
Solution	σs [Å]		0.89 ± 0.02

Results obtained from fits of the XRR data in 0.01 M NaCl +  + 0.25 mM PbCl₂ by the models described in the text. Given are the width of the Hg surface layer σ_i, the coverages and distance to the Hg surface layer of the precursor adlayer phases Pb(OH)Br_ad-I and Pb(OH)Br_ad-II, and the width of the interface to the electrolyte solution σ_s. The standard errors of the best-fit parameters were calculated by the covariance matrix method.