Patent ID: 7804648

Claim:
A multilayer reflective film coated substrate, comprising: a multilayer under film, which consists of a first plurality of first Mo/Si alternately-layered films and is formed on a substrate, the first plurality of first Mo/Si alternately-layered films being formed by alternately laminating a first combination of an Si layer and a Mo layer as one cycle so that a cycle length of the multilayer under film is given as d bottom (unit:nm), and a multilayer reflective film, which consists of a second plurality of second Mo/Si alternately-layered films for reflecting exposure light and is formed on the multilayer under film, the second plurality of second Mo/Si alternately-layered films being formed by alternately laminating a second combination of an Si layer and a Mo layer as one cycle so that a cycle length of the multilayer reflective film is given as d top (unit:nm), the cycle length of each said second plurality of second Mo/Si alternately-layered films being substantially the same, wherein d bottom>d top, and a relationship of a formula (1) is satisfied when d bottom>d top, the formula (1) being given by ( n+ 0.15)× d top≦ d bottom≦( n+ 0.9)× d top where n is a natural number equal to or greater than 1.