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The formation of codimension-one interfaces for multiwell gradient-drivenproblems is well-known and established in the scalar case, where the equationis often referred to as the Allen-Cahn equation. The vectorial case in contrastis quite open. This lack of results and insight is to a large extend related tothe absence of known appropriate monotonicity formula. In this paper, we focuson the elliptic case in two dimensions, and introduce some methods which allowto circumvent the lack of monotonicity formula. This methods lead, as expected,to concentration on one-dimensional rectifiable sets.

Concentration sets for multiple equal-depth wells potentials in the 2D elliptic case