Recent studies of polythiophene using HiFi have suggested that ALC should be a very sensitive probe of the structural state of a polymer via its effect on the spatial extent of the spin distribution in the muon radical, with a shift in resonance position as large as 50% having been seen in P3OT, depending on its state of crystallinity. In order to get a good calibration between resonance position and the constrained spatial extent of the radical imposed by the local structure of the polymer, we are engaged in measuring the solid-state ALC spectra of a set of thiophene oligomers. The corresponding muon radical spectra have been calculated using DFT and both theoretical and experimental evidence is found for addition to S as well as C sites. Resonance splittings are also found at low temperature, showing the effect of solid-state intermolecular interactions on the radical structure.