**Appendix A**

**Figure A1.** Percentage of HA and SiHA thin films annealed at 600 ◦C remaining as a percentage of original coating Ca content. Data plotted is mean ± standard error of the mean; n = 4. Non-linear one-phase decay regression plots were calculated using GraphPad Prism software based on the data shown. Due to the high variance of the SiHA1 sample, a suitable regression line was unable to be plotted, hence a probable area has manually been fitted for visual enhancement.

**Figure A2.** XRD plot for a Plasma Biotal plasma sprayed copper backed target. All major di ffraction planes are indexed. Arrows indicate potential β-TCP secondary phase, however, with the low intensity accurate quantification is di fficult.
