In this proposal we aim to study low temperature structure of hydrogen in the interlayer region of partially hydrated pillared clays. There are linked dual motivations for this experiment: (i) understanding the fundamental (quantum) properties of confined molecular hydrogen, and; (ii) the search for improved hydrogen storage materials. We will study H2 in synthetic high charge Na, Ca- and Mg-laponite. Before each experiment the samples will be treated with D2O to expand the interlayer region to around 3.5 ¿ 6.0 Å, and then be baked out at between 60 to 140C to yield partially hydrated samples which we have shown readily accept H2 and D2. Sequential dosing with H2/D2 will be conducted in situ around 50K and < 2.0 bar. We are particularly interested in the local structure around the H2 including the interaction with interlayer cations and clay surfaces, and the formation of 2-D liquid H2.