Conventional metal electromagnetic interference (EMI) shielding cans suffer from low conformability, thickness‑performance trade‑offs, and incompatibility with advanced packaging processes. MXene nanosheets demonstrate significant potential for EMI shielding; however, they suffer from low environmental stability and bottlenecks related to film thickness. In 2025, Kang et al. published a work in Nature that overcomes thickness limitation through an embedded-MXene-in-metal shielding non-porous ultrathin structure, achieving remarkable shielding effectiveness of 70 dB and 80 dB at respective thickness of 1 μm and 1.9 μm in the X-band. The work resolves the longstanding thickness-performance dilemma in EMI shielding and provides conformal protection for USB 3.0 flash drives and flexible Schottky diodes.