(a) The experimental setup and the clamped monomorph. (b) Eight forms of electrode connections. The parallel electrode connection: connection 1-2. Four perpendicular electrode connections: connection 1–3, 1–4, 2-3, and 2–4. Two partial superposed perpendicular electrode connections: connection 1–34 and 2–34. The whole superposed perpendicular electrode connection: connection 12–34. Connection 1-2 means that no. 1 wire is connected to the out-1 test point, and no. 2 wire is connected to the out-2 test point. Connection 1–3 (similar to connection 1–4, 2-3, and 2–4) means that no. 1 wire is connected to the out-1 test point, and no. 3 wire is connected the out-2 test point. Connection 1–34 (similar to connection 2–34) means that no. 1 wire is connected to the out-1 test point, and no. 3 wire and no. 4 wire are connected to the out-2 test point. Connection 12–34 means that no. 1 and no. 2 wires are connected to the out-1 test point, and no. 3 no. 4 wires are connected to the out-2 test point (color online).