中文摘要：

这篇论文的目标是在问题有的二分层的背景 medium.These 调查三维的电磁的散布问题在今天的重要应用是技术，例如检测在 soil.Here 被埋葬的目标，我们在 R3.We 为外面的阻抗问题和不同类的中等问题建模为二的答案建立唯一和存在分别地散布问题。

英文摘要：

The object of this paper is to investigate the three-dimensional electro- magnetic scattering problems in a two-layered background medium. These problems have an important application in today＇s technology, such as to detect objects that are buried in soil. Here, we model both the exterior impedance problem and the inhomogeneous medium problem in R3. We establish uniqueness and existence for the solution of the two scattering problems, respectively.