Lüders deformation is a persistent challenge in metallic material science and widely observed across various materials. Lüders band manifests as local plastic instability and hinders engineering applications. In recent years, heterogeneous structures have been shown to suppress local strain concentration and can help mitigate Lüders deformation. This study investigates the impact of layered structures on Lüders deformation in bi-layered steel/aluminum sheet materials with varying thickness ratios. Utilizing digital image correlation (DIC) and finite element (FE) modeling, the study finds that the inclusion of an aluminum layer reduces the magnitude of Lüders deformation of the steel/aluminum sheet. This leads to decreases in both upper and lower yield strengths and in Lüders strain as the thickness ratio decreases. FE analysis reveals that Lüders strain is primarily influenced by the product of stress drop and the local stress peak width ratio at the Lüders front. This study offers valuable insights into alleviating Lüders deformation through heterogeneous structural design.