  We show that interference between parallel currents through two quantum dots,
in presence of spin orbit interactions and strong on-site Coulomb repulsion,
leads to resonances in current noise at the corresponding Larmor frequencies.
An additional resonance at the difference of Larmor frequencies is present even
without spin-orbit interaction. The resonance lines have strength comparable to
the background shot noise and therefore can account for the numerous
observations of spin resonance in STM noise with non-polarized leads. We solve
also several other models that show similar resonances.
