Single-molecule magnets (SMMs) are paramagnetic molecules with energy barriers U eff that impede the reversal, or relaxation, of their magnetic moment. At the lowest temperatures, the scarcity of available phonons means that magnetisation relaxation is sufficiently slow such that the moment is often considered "blocked" on the time scale of the measurements, and can show memory effects. Rapid advancements in synthetic organometallic chemistry have recently led to vast increases in the magnitude of this barrier, raising the temperature at which memory effects can be observed. The most common technique to characterise the magnetisation relaxation rate in SMMs is alternating current (AC) magnetic susceptibility measurements. The frequency-dependence of the complex AC susceptibility, χ AC , is usually fit to the Generalised Deybe model: χ AC (ω