The two blocks $A$ and $B$ of equal mass are initially in contact when released from rest on the inclined plane. The coefficients of friction between the inclined plane $A$ and $B$ are $\mu_1$ and $\mu_2$ respectively.
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The block with lower value of $\mu$ tend to have greater acceleration down the slope. Hence, if $\mu_{1}>\mu_{2}$ the blocks will always remains in contact and if $\mu_{1}<\mu_{2}$ the blocks will slide down with different accelerations.
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