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Determine the relative sign of the gap on the two electron pockets and whether it varies between the two Fe sublattices.","problem_ref":"9ff0930d0137b766b61844e80abee14a6e8de9b896f5982ff408f761b51ec194","references":"","settled_by":"A phase-sensitive measurement (phase-referenced quasiparticle interference, impurity bound-state spectroscopy, or Josephson interferometry) giving the relative gap sign on the two electron pockets.","status_note":"Scanning tunneling spectroscopy found coherence peaks that differ between the two Fe sublattices, interpreted as $\\eta$-pairing between $k$ and $-k+Q$ (Ding et al., Physical Review Letters 136, 066502, 2026, arXiv 2406.15239).","title":"Pairing symmetry of monolayer FeSe on 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