Previous work on the polymer RR-P3HT has found that the ALC resonance collapses at 100K to ~80% of the 300K ALC magnitude, this is much larger than the decrease seen for small molecules and the polymers PTAA and P3OT (10K ALC ~50-60% of the 300K ALC). Initially it was thought that this large decrease was due to the formation of delocalised bands in P3HT. Further work has found the presence of magnetic impurities in RR-P3HT, which may also cause the large decrease. Thus we request beamtime to study the polymer RRa-P3HT, which we know does not contain magnetic impurities, and measure the ALCs as a function of temperature for RRa-P3HT and RRa-P3HT+1%Fe or FeO powder. The Fe or FeO powder will be added to mimic the magnetic impurities (ferromagnetic or superparamagnetic) in RR-P3HT, thus if these impurities are causing the collapse, we should measure the large decrease in the ALC magnitude