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Based on a variant of the frequency function approach of Almgren, weestablish an optimal bound on the vanishing order of solutions to stationarySchr\"odinger equations associated to a class of subelliptic equations withvariable coefficients whose model is the so-called Baouendi-Grushin operator.Such bound provides a quantitative form of strong unique continuation that canbe thought of as an analogue of the recent results of Bakri and Zhu for thestandard Laplacian.

Quantitative uniqueness for zero-order perturbations of generalized Baouendi-Grushin operators