Thickness Effects on Acoustic Parameters of TiO 2 Layers on SiO 2 , Ti, Al 2 O 3 , and Si Substrates. - Doghmane, Houssem Eddine; Sakher, Elfahem; Nebti, Djamila; Touati, Ibtissem; Othmane, Djemâa Ben; Tahri, Tourkia; Tene, Talia; Vacacela Gomez, Cristian; Gahramanli, Lala; Khankishiyeva, Rana; Doghmane, Abdellaziz (Coatings (2079-6412), 2026)