This repository contains the relevent data that support the findings of: Spin-singlet to triplet Cooper pair converter interface M. Rogers, A. Walton, M.G. Flokstra, R. Stewart, S. Lee, T. Prokscha, A.J. Caruana, C. J. Kinane, S. Langridge, F. Al Ma’Mari, H. Bradshaw, T. Moorsom, M. Ali, G. Burnell, B.J. Hickey, and O. Cespedes. The data have been split in alignment to the structure of the manuscript; \\Fig1 - PNT_XRR_TEM This folder contains the neutron reflectivity, X-ray reflectivity and transmission electron microscopy performed on a prototypical Nb/C60/Cu/C60/Au system. \\Fig2 - Low-Temperature Transport This folder contains the low-temperature transport measurements performed of Nb/C60/Au systems \\Fig3 - Single-Probe LEM This folder contains the low-energy muon (LEM) spin rotation data performed on Nb/C60/Cu/C60/Au and Nb/C60/Au stacks. \\Fig4 - Multi-Probe LEM This folder contains the LEM data acquired from Nb/C60/Cu/C60/Au/C60/Au/C60/Au and Nb/C60/Au/C60/Au/C60/Au stacks.