| Summary: | The properties of sub-monolayer Helium-3 films adsorbed on two totally different but planar substrates, Mylar<sup>†</sup> film and exfoliated graphite have been studied using NMR. The nuclear magnetic relaxation times T<sub>1</sub> and T<sub> 2</sub> have been measured as functions of fractional monolayer completion, temperature, substrate plane orientation and Larmor frequency using a specially designed and constructed NMR spectrometer system. The results obtained with a Mylar film substrate are consistent3with the formation of patches of solid <sup>3</sup>He at regions of preferential adsorption on the substrate. Measurements of T<sub>2</sub> m very low coverage <sup>3</sup>He films on exfoliated graphite also indicate that the adsorbate forms areas of relatively high density solid, in agreement with the thermodynamic analysis of Elgin and Goodstein. Finally, detailed measurements of T<sub>2</sub> as a function of all of the above parameters at low areal densities will help us to characterise the relaxation processes for the fluid phase of <sup>3</sup><sup>3</sup>He on exfoliated graphite. <sup>†</sup>Mylar is the tradename of poly(ethelene-terephthalate) film, marketed by Du Pont.
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