The average chemical compositions of GBP and BBP films in atomic percent.
| Atomic% | C | O | Fe | N | Mg | P | Mn | Ca | S | K | Cl | Si |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thick GBP | 59.3 ± 1.3 | 35.3 ± 0.9 | 0.8 ± 0.1 | 0.7 ± 0.1 | — | 0.2 ± 0.1 | — | 1.4 ± 0.1 | 0.6 ± 0.1 | 1.0 ± 0.3 | 0.4 ± 0.1 | 0.4 ± 0.1 |
| Thin GBP | 55.1 ± 2.0 | 35.0 ± 0.8 | 7.2 ± 0.8 | 1.8 ± 0.3 | — | 0.5 ± 0.2 | 0.5 ± 0.2 | — | — | — | — | — |
| Thick BBP | 55.2 ± 1.1 | 31.7 ± 2.2 | — | 1.4 ± 0.1 | 1.5 ± 0.2 | 1.2 ± 0.1 | — | 1.8 ± 0.1 | 1.0 ± 0.3 | 2.2 ± 1.2 | 4.0 ± 1.4 | — |
| Thin BBP | 63.3 ± 0.3 | 28.8 ± 0.7 | 3.4 ± 0.4 | 2.8 ± 0.3 | — | 0.8 ± 0.3 | 0.2 ± 0.1 | 0.7 ± 0.1 | — | — | — | — |