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Experimental efforts to measure neutrinos by radio-frequency (RF) signalsresulting from neutrino interactions in-ice have intensified over the lastdecade. Recent calculations indicate that one may dramatically improve thesensitivity of ultra-high energy ("UHE"; >EeV) neutrino experiments viadetection of radio waves trapped along the air-ice surface. Detectors designedto observe the "Askaryan effect" currently search for RF electromagnetic pulsespropagating through bulk ice, and could therefore gain sensitivity if signalsare confined to the ice-air boundary. To test the feasibilty of this scenario,measurements of the complex radio-frequency properties of severalair-dielectric interfaces were performed for a variety of materials.Two-dimensional surfaces of granulated fused silica (sand), both in the lab aswell as occurring naturally, water doped with varying concentrations of salt,natural rock salt formations, granulated salt and ice itself were studied, bothin North America and also Antarctica. In no experiment do we observeunambiguous surface wave propagation, as would be evidenced by signalstravelling with reduced signal loss and/or superluminal velocities, compared toconventional EM wave propagation.

Experimental Probes of Radio Wave Propagation near Dielectric Boundaries and Implications for Neutrino Detection