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We consider the ground states, excitations and dynamics of aquasi-two-dimensional binary dipolar Bose-Einstein condensate. Our focus is onthe transition to a spin-stripe ground state in which the translationalinvariance is spontaneously broken by a striped immiscible pattern of thealternating components. We develop a ground state phase diagram showing theparameter regime where the spin-stripe state occurs. Using Bogoliubov theory wecalculate the excitation spectrum and structure factors. We identify a balancedregime where the system has a $\mathbb{Z}_2$ symmetry, and in the spin-stripestate this yields a nonsymmorphic symmetry. We consider the evolution of thesystem following a quench from the uniform to spin-stripe state, revealingnovel ordering dynamics involving defects of the stripe order. Using an orderparameter to characterize the orientational order of the stripes, we show thatthe phase ordering exhibits dynamic scaling.

Excitations and phase ordering of the spin-stripe phase of a binary dipolar condensate