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We prove weak and strong boundedness estimates for singular integrals in $\R^d$ with respect to $(d-1)$-dimensional measures separated by Ahlfors-David regular boundaries, generalizing and extending results of Chousionis and Mattila. Our proof follows a different strategy based on new Calder\'on-Zygmund decompositions which can be also used to extend a result of David.

Strong and Weak Type Estimates for Singular Integrals with Respect to Measures Separated by AD-regular Boundaries