As also indicated in the PCR document, the experimental IFF FOM can be downloaded from https://www.sisostds.org/DigitalLibrary.aspx?EntryId=50505. At this moment it is still in the version 0.1, as shared with some after the May 2nd DG meeting. Anyone with an interest in IFF (and RPR FOM) is encouraged to try out this experimental FOM and report any issue or suggestion for improvement!
(Please, do note that no promise whatsoever is made to the degree in which the IFF modeling in the experimental FOM will be incorporated in the final RPR FOM v3.0. The PCR discussion is still fully open!)
Given that the PCR in this version A contains several discussion topics, one or more updates to the PCR are expected. Following discussions in DG meetings, new versions of the PCR document will be uploaded to the digital library. The link given above will always provide the latest version of the PCR.