Constraining black hole spin in PG 1535+547 amid complex multi-layered absorption

Acknowledgements: We thank the anonymous referee for their helpful comments and suggestions. DJW acknowledges support from the Science and Technology Facilities Council (STFC; grant code ST/Y001060/1). TD acknowledges support from the DFG research unit FOR 5195 (grant number WI 1860/20-1). The work of DS was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). This research made use of data obtained with NuSTAR, a project led by Caltech, funded by NASA, and managed by the NASA Jet Propulsion Laboratory (JPL), and utilized the nustardas software package, jointly developed by the Space Science Data Centre (SSDC; Italy) and Caltech (USA). This research also made use of data obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States.