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The magnetic field B_c, in which the electrons become fully spin-polarized,is found to be proportional to the deviation of the electron density from thezero-field metal-insulator transition in a two-dimensional electron system insilicon. The tendency of B_c to vanish at a finite electron density suggests aferromagnetic instability in this strongly correlated electron system.Comment: 4 pages, postscript figures included. Revised versio

Indication of the Ferromagnetic Instability in a Dilute Two-Dimensional Electron System