HY Guo, LF Wang, WH Ye, JF Wu, YJ Li… - Chinese Physics …, 2018 - iopscience.iop.org
… We consider three spherical fluid layers separated by an inner interface of radius R 1 and
an outer interface of radius R 2 (R 2 = R 1 + ΔR), where Δ R is the thickness of the middle layer…