= Solution
A distinct possibility is \b[terminal <sulfur> coordination], $\mathrm{M\leftarrow S-C\equiv N}$. Unlike the <sulfur> donor in the layer, this <sulfur> need bind only one <metal>. The limiting $\mathrm{^-S-C\equiv N}$ <resonance structure> suggests \b[$r_{\rm CN}\approx1.15\,\mathring{\mathrm A}$ and $r_{\rm CS}\approx1.8\,\mathring{\mathrm A}$]. These are single-/triple-bond-based estimates, not exact predictions for an unspecified <metal> complex. The M–S–C linkage should be bent, consistent with <sulfur> lone-pair donation.
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