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Let $\Omega^+\subset\mathbb R^{n+1}$ be a bounded $\delta$-Reifenberg flatdomain, with $\delta>0$ small enough, possibly with locally infinite surfacemeasure. Assume also that $\Omega^-= \mathbb R^{n+1}\setminus\overline{\Omega^+}$ is an NTA domain as well and denote by $\omega^+$ and$\omega^-$ the respective harmonic measures of $\Omega^+$ and $\Omega^-$ withpoles $p^\pm\in\Omega^\pm$. In this paper we show that the condition that$\log\dfrac{d\omega^-}{d\omega^+} \in VMO(\omega^+)$ is equivalent to$\Omega^+$ being a chord-arc domain with inner normal belonging to$VMO(H^n|_{\partial\Omega^+})$.

The two-phase problem for harmonic measure in VMO and the chord-arc condition