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We derive oscillatory signals in correlation functions in two-field openinflation by means of the in-in formalism; such signatures are caused byresonances between oscillations in the tunnelling field and fluctuations in theinflaton during the curvature dominated, intermediate and subsequentinflationary regime. While amplitudes are model-dependent, we find distinctoscillations in the power and bi-spectrum that can act as a direct probe of thecurvature dominated phase and thus, indirectly, strengthen the claim of thestring landscape if they were observed. We comment on the prospects ofdetecting these tell-tale signs in current experiments, which is challenging,but not impossible.  At the technical level, we pay special attention to the applicabilityconditions for truncation fluctuations to the light (inflaton) field and deriveupper limits on the oscillation amplitude of the heavy field. A violation ofthese bounds requires a multi-field analysis at the perturbed level.

Probing Two-Field Open Inflation by Resonant Signals in Correlation Functions