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A two-dimensional readout with metal strips deposited on both sides of a glass plate is investigated aiming to assess the possibility of its use in a liquid xenon ionisation chamber for positron emission tomography. Here, we present results obtained with an α-source. It is shown that position resolution of =<1mm, fwhm, can be achieved for free charge depositions equivalent to those due to γ-rays with energy from 220 down to 110keV.