At Tohoku University, researchers have discovered that the number of atomic layers in a crystal is not merely a structural detail but a design lever — one capable of tuning the magnetic and quantum electronic behavior of materials with deliberate precision. By synthesizing a previously unknown compound, Ce₃Au₄Ge₂Bi₄, Professor Hideaki Sakai and his team demonstrated that the long-established chemical principle of homologous series can be extended into the frontier of topological quantum materials. Where the search for such materials once resembled prospecting in the dark, this work offers some