If you have enough material, XRF may give you percentage of selected elements as well. If you know stoichiometry of the compounds forming your composite, you can then recalculate for wt.% of each component.
If you know the metals present in your compound you can carry out EDX ( Energy Dispersive X-Ray Analysis ) to get the percentage composition. Else first you have to do XRD ( X-ray powder diffraction ) to identify the metals present in your compound and then proceed to EDX for percentage composition.