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An experimental investigation of the Cs $6s2S1/2\to 6p2P3/2\to 10s2S1/2$ double resonance two-photon polarization spectrum has been made. In the investigation, a linear polarization degree was measured to extract the alignment depolarization cross section in the cesium $6p2P3/2$ level due to collisions between ground-level argon and excited $6p2P3/2$ cesium atoms over the Zeeman coherences. The spectra show strong depolarization of the Cs $6p2P3/2$ level. The measured alignment depolarization cross section value of $186$ (58)$ \AA^2$ is in good agreement with experiment and theoretical predictions.