Summary of the constraints for the 4 techniques.
| XRD | XRF | FTIR | Raman | |
|---|---|---|---|---|
| Penetration depth | 1 mm | 3 mm | μ Scale | μ Scale |
| Spot size | 8 × 8 mm | 1 mm diameter | 3 mm diameter | μ Scale |
| Plate size and dimension | Optimized template | No constraint | Optic alignment | No constraint |