| Atom | U (Å2) | ||
| Bi (1) | 0.0305 | 0.0177 | 0.0122 |
| Bi (2) | 0.0278 | 0.0139 | 0.0114 |
| Bi (3)* | 0.0468 | 0.0199 | 0.0131 |
| I | 0.0221 | 0.0158 | 0.0158 |
| S (1) | 0.0282 | 0.0144 | 0.0019 |
| S (2) | 0.0267 | 0.0117 | 0.0059 |
| S (3) | 0.0265 | 0.0121 | 0.0084 |