  We probe optimal beam polarizations for new-physics search in top-quark and
Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible
non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6
effective operators as anomalous top and Higgs couplings, we estimate expected
statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX,
using the optimal-observable method.
