MSEN (IMAGE) Texas A&M University Caption A helicoid structure has two sides (surfaces). If one side is material A and the other side is material B, it is possible to transverse uninterruptedly along the defect staying within the A layer without crossing through the B layer. Credit Texas A&M Engineering Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.