Hi All, In a multilayered thin flims on thick substrate structure, I noticed that people often talk about interfacial stresses like shear and peel stress. Do anyone know what peel stress is and how to calculate peel stress ? Any good reference ? Can anyone suggest a good reference book on thin film thermal stress ? Some introductory text on normal stress and interfacial stress will be very useful to me. Many thanks !!! Chuan Seng