On the existence of large subspaces of $C(K)$ that perform stable phase retrieval

The purpose of this article is to address an open problem posed by Freeman-Oikhberg-Pineau-T.~($\mathit{\text{Math.}}\mathit{\text{Ann.}}$~2024) regarding the existence of large subspaces of $C(K)$ that perform stable phase retrieval (SPR). We begin by proving that for both the real and complex fields, the space $C(K)$ admits an infinite-dimensional SPR subspace if and only if the second Cantor-Bendixson derivative $K{}^{\mathrm{\prime }\mathrm{\prime }}$ is nonempty. We then show how to construct ``large" SPR subspaces of $C(K)$, where the size of the subspace depends quantitatively on the number of non-trivial Cantor-Bendixson derivatives that the compact Hausdorff space $K$ possesses.