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The quantum kicked rotor (QKR) model is a prototypical system in the researchof quantum chaos. In a spin-$1/2$ QKR, tuning the effective Planck parameterrealizes a series of transitions between dynamical localization phases, whichclosely resembles the integer quantum Hall (IQH) effect and the plateautransitions. In this work, we devise and apply the finite-size scaling analysisto the transitions in the spin-$1/2$ QKR model. We obtain an estimate of thecritical exponent at the transition point, $\nu=2.62(9)$, which is consistentwith the IQH plateau transition universality class. We also give a preciseestimate of the universal diffusion rate at the metallic critical state,$\sigma^{*}=0.3253(12)$.

Finite-Size Scaling Analysis of the Planck's Quantum-Driven Integer Quantum Hall Transition in Spin-$1/2$ Kicked Rotor Model