Have you confirmed about the deposition or coating of multilayer PZT?? Because after following the below article and your XRD data, I am confused whether PZT is formed properly or not as the later contains more reflections. Moreover, your XRD data is no noisy, I hope you need to run in a very slow scan to reveal the peaks related to the PZT. Then go for Rietveld refinement. The parameters you need to carry out are space group of PZT, a, b, c values(lattice parameters), x, y, z (atomic positions), instrument file.,