Polyethylene naphthalate multilayered film for high density magnetic recording medium

A polyethylene naphthalate multilayered film for a high density magnetic recording medium comprising:

• a polyethylene naphthalate layer (A) having a first surface and a second surface, and
• a polyethylene naphthalate layer (B) having a laminating surface and a protrusion surface, said layer (B) being laminated on at least one surface of said polyethylene naphthalate layer (A), and having a thickness of not more than 2 .mu.m and characteristics represented by the following formulae (1)-(3), and
• the multilayered film having characteristics represented by the following formula:
• 0.002.ltoreq.Ra.ltoreq.0,010 (1)
• H.sub.2 .ltoreq.0.1 (2)
• 50.ltoreq.Pc (3)
• Y.gtoreq.700 (4)
• wherein
• Ra represents a center line average roughness, measured in micrometers, at the surface of the polyethylene naphthalate layer (B),
• H.sub.2 represents the number of second or higher order protuberances in the surface of the polyethylene naphthalate layer (B), measured in units of number/25 cm.sup.2, determined by the multiple interference method,
• Pc represents the number of peak counts at the surface of the polyethylene naphthalate layer (B), measured in units of number/0.8 mm, and
• Y represents Young's modulus in the machine direction and transverse direction of the film, measured in units of kg/mm.sup.2.