  We study the excitation of mutual inclination between planetary orbits by a
novel secular-orbital resonance in multiplanet systems perturbed by binary
companions which we call "ivection". The ivection resonance happens when the
nodal precession rate of the planet matches a multiple of the orbital frequency
of the binary, and its physical nature is similar to the previously-studied
evection resonance. Capture into an ivection resonance requires encountering
the resonance with slowly increasing nodal precession rate, and it can excite
the mutual inclination of the planets without affecting their eccentricities.
We discuss the possible outcomes of ivection resonance capture, and we use
simulations to illustrate that it is a promising mechanism for producing the
mutual inclination in systems where planets have significant mutual inclination
but modest eccentricity, such as Kepler-108. We also find an apparent deficit
of multiplanet systems which would have nodal precession period comparable to
binary orbital period, suggesting that ivection resonance may inhibit the
formation or destablize multiplanet systems with external binary companion.
