Sliding ferroelectricity of multilayer h-BN

interlayer sliding. Among these, 30 configurations are non-centrosymmetric. This provides more options for exhibiting ferroelectricity than the bilayer system, where only AB/BA stacking configurations possess an electric dipole moment. We systematically calculate the different characteristics of single-layer sliding and double-layer sliding in trilayer h-BN. When the number of layers further increases, we propose two stacking strategies to enhance electric dipole moments: (1) introducing AB stacking for polarization accumulation and (2) employing AA' antiparallel stacking to amplify vertical dipoles. These findings provide fundamental insights into sliding ferroelectric mechanisms in h-BN multilayers and establish design principles for developing ultracompact ferroelectric devices with tailored polarization characteristics.