= Solution
An in-plane <magnetic field> lowers the <Zeeman energy> when moments align with it. It competes with antiferromagnetic <interlayer exchange coupling>; the layers generally cant or switch toward a parallel configuration and ultimately saturate if the field overcomes coupling and <magnetic anisotropy>. \b[The high-resistance antiparallel state evolves toward the lower-resistance parallel state.] The switching path and field scale depend on anisotropy, pinning and coupling strength, which are not numerically specified.
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