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We report on the modification of the g-factor by an in-plane electric fieldin an In$_{0.031}$Ga$_{0.969}$As epilayer. We performed external magnetic fieldscans of the Kerr rotation of the InGaAs film in order to independentlydetermine the g-factor and the spin-orbit fields. The g-factor increases from$-0.4473\pm0.0001$ at 0 V/cm to $-0.4419\pm0.0001$ at 25 V/cm applied along the[1$\overline{1}$0] crystal axis. In addition, spatially-resolved spinmeasurements show a g-factor dependence on diffusive velocity. The change ing-factor with electric field can have a large effect on the determination ofthe internal spin-orbit and nuclear fields from Larmor precession frequencymeasurements.

g-Factor Modification in a Bulk InGaAs Epilayer by an In-plane Electric Field