We wish to investigate the evolution of the low-field ALC peaks with temperature of TMS-Pentacene, so we can extract the temperature dependent electron spin relaxation rate. Our ultimate goal is to find out how the functionalisation of molecules affects the spin relaxation rate in organic semiconductors. The result could lead to major breakthrough in the understanding of spin dynamics in organic semiconductors, possibly generalised to all disordered materials. Most theories of spin relaxation rely on bands resulting from the periodic crystal lattice and therefore are not applicable to disordered materials. Whilst we believe that we already have sufficient data on TIPS-Pentacene and Rubrene to achieve a high-profile publication, we believe the detailed temperature dependence outlined here will significantly aid the theoretical model we are developing and increase the profile of the paper.