Apple reportedly only has one partner to make chips for the next iPhones after the XS/R series: TSMC. These A13 processors are likely to be 7nm in die size. If so, TSMC could make history in being the first company to manufacture this architecture using the EUV technique.
https://www.notebookcheck.net/2019-iPhone-processors-to-be-exclusively-provided-by-TSMC.338120.0.html