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Element concentrations in the samples’ surface layers according to XPS data (at. %).
| Sample | C | O | Ca | S | P | Si | Ru |
|---|---|---|---|---|---|---|---|
| PG-1 | 10.6 | 56.2 | 15.7 | 11.3 | 3.4 | 2.8 | - |
| PG-2 | 8.9 | 56.6 | 15.9 | 15.1 | 1.7 | 1.7 | 0.1 |
| PG-3 | 11.1 | 53.0 | 15.9 | 17.5 | 1.5 | 0.8 | 0.2 |
| PG-3et | 7.7 | 54.5 | 17.0 | 18.0 | 1.6 | 1.0 | 0.2 |
