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Experiments disagree on whether this phase exists and what form it takes.","posed_since":"2007","precise":"In $3\\mathrm{He}$ confined to slabs of thickness $D \\sim 1e-4\\,\\mathrm{cm}$ with pair-breaking walls, quasiclassical theory predicts a stripe phase (Vorontsov and Sauls 2007) of periodic domain walls in a planar-distorted B order parameter, between the A and B phases. Determine whether a modulated phase exists, its period and its region in $\\left(D, P, T\\right)$, and distinguish a stripe phase from a pair-density-wave state and from a polar-distorted B phase with pinned domain walls. An answer is a phase diagram with direct evidence of the modulation.","problem_ref":null,"references":"","settled_by":"NMR line shapes or flow measurements in slabs of several thicknesses whose features match the predicted modulation period and its D dependence.","status_note":"NMR in a 1.1e-4 cm slab (Levitin et al. 2019) gave evidence for a stripe phase; a nanofluidic resonator experiment (Shook et al. 2020) claimed a pair-density-wave state, and a 2020 Comment by Levitin et al. disputed that interpretation.","title":"Spatially modulated superfluid phase of 3He in thin 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