We have experimentally investigated the regular tip-splitting (RTS) behavior of an NH4Cl dendrite. In the RTS phenomenon, 〈110〉 growth occurs very close to the 〈100〉 growing tip and stops at once because of a concentrational interaction with the tip and a nearby side-branch. The formation of the tip changes under the influence of the 〈110〉 growth. The tip velocity oscillates in time like a square wave.
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