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An attractive pathway of producing sizable 2D crystallites of tin is based on deintercalation of bulk compounds with suitable tin frameworks. Here, we have identified a new synthesizable metal distannide, NaSn<jats:sub>2<\/jats:sub>, with a 3D stacking of flat hexagonal layers and examined a known compound, BaSn<jats:sub>2<\/jats:sub>, with buckled hexagonal layers. Our<jats:italic>ab initio<\/jats:italic>results illustrate that despite being an exception to the 8-electron rule, NaSn<jats:sub>2<\/jats:sub>should form under pressures easily achievable in multi-anvil cells and remain (meta)stable under ambient conditions. Based on calculated<jats:italic>Z<\/jats:italic><jats:sub>2<\/jats:sub>invariants, the predicted NaSn<jats:sub>2<\/jats:sub>may display topologically non-trivial behavior and the known BaSn<jats:sub>2<\/jats:sub>could be a strong topological insulator.<\/jats:p>","DOI":"10.1038\/srep28369","type":"journal-article","created":{"date-parts":[[2016,7,8]],"date-time":"2016-07-08T09:02:25Z","timestamp":1467968545000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Ab initio engineering of materials with stacked hexagonal tin frameworks"],"prefix":"10.1038","volume":"6","author":[{"given":"Junping","family":"Shao","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cl\u00e9ment","family":"Beaufils","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aleksey N.","family":"Kolmogorov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,7,8]]},"reference":[{"key":"BFsrep28369_CR1","doi-asserted-by":"crossref","first-page":"193410","DOI":"10.1103\/PhysRevB.83.193410","volume":"83","author":"Q Zhu","year":"2011","unstructured":"Zhu, Q., Oganov, A. 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